CN105467566A - Large-aperture wide-angle zoom lens - Google Patents

Abstract

The invention belongs to the technical field of optical lenses, and particularly relates to a large-aperture wide-angle zoom lens, which comprises a zoom group and a compensating group, wherein the zoom group has positive total optical power, the compensating group has negative total optical power, and zoom is carried out through changing the interval between the zoom group and the compensating group; the compensating group comprises a first lens, a second lens and a third lens arranged sequentially from the object side; the zoom group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged sequentially from the object side; the fourth lens is a glass aspherical lens; and the focus Ff' of the compensating group and the focus Bf' of the zoom group meet the following condition: 0.8<|Ff'/Bf'|<1.1. In comparison with the prior art, a mixture of a glass spherical lens and a glass aspherical lens is adopted, the aspherical lens has a stronger aberration correction ability, higher performance can be achieved, the reasonably-arranged glass aspherical lens can replace a plurality of glass spherical lenses, the optical structure of the lens can be simplified, the size is reduced, and the assembly efficiency is enhanced.

Description

A kind of large aperture wide-angle zoom lens

Technical field

The invention belongs to optical lens technical field, particularly relate to a kind of large aperture wide-angle zoom lens.

Background technology

Large aperture zoom lens has the advantage that logical light quantity is large, picture is bright, particularly with the large aperture zoom lens of auto iris, can obtain the picture of various magnification, various brightness according to various different environment, adaptability is fabulous, is therefore favored widely.

But the usual bulky of large aperture zoom lens, expensive, and image quality is not good, and usual resolution is about a mega pixel.

Along with security protection industry is to high Qinghua, miniaturization, common large aperture zoom lens can not satisfy the demands.Therefore the little large aperture high definition zoom lens of a kind of volume is developed just necessary.

But wide-aperture zoom lens research and development difficulty is larger, usually need many spheric glasses can reach the performance of expection.And the number of number of lenses is directly connected to the manufacturing cost of camera lens, more eyeglass also can make the volume of camera lens uncontrollable in a less level.Therefore according to the camera lens of full spheric glass, then a good balance cannot be obtained on volume, performance, cost.

In view of this, necessaryly provide a kind of large aperture wide-angle zoom lens, it adopts mixing of glass spheric glass and Glass aspheric eyeglass, aspheric surface possesses stronger aberration correction ability, can reach higher performance, reasonably arranging Glass aspheric eyeglass can substitution number piece glass spheric glass, can simplify the optical texture of camera lens thus, reduce volume, promote efficiency of assembling.

Summary of the invention

The object of the invention is to: for the deficiencies in the prior art, and a kind of large aperture wide-angle zoom lens is provided, it adopts mixing of glass spheric glass and Glass aspheric eyeglass, aspheric surface possesses stronger aberration correction ability, can reach higher performance, reasonably arranging Glass aspheric eyeglass can substitution number piece glass spheric glass, can simplify the optical texture of camera lens thus, reduce volume, promote efficiency of assembling.

In order to achieve the above object, the present invention adopts following technical scheme:

A kind of large aperture wide-angle zoom lens, comprise zoom group and compensating group, total focal power of described zoom group is just, total focal power of described compensating group is negative, carries out zoom by the interval changing described zoom group and described compensating group;

Described compensating group comprises from object space side the 3rd lens of the first lens of tactic convex-concave negative power, the second lens of concave-concave negative power and convex-concave positive light coke;

Described zoom group comprises the tenth lens of the 4th lens of the tactic convex-concave positive light coke from object space side, the 5th lens of biconvex positive light coke, the 6th lens of convex-concave negative power, the 7th lens of convex-concave positive light coke and the 8th lens of biconvex positive light coke, the 9th lens of concave-concave negative power and biconvex positive light coke;

Described 4th lens are glass aspheric lenses;

The focal length Ff' of described compensating group and the focal length Bf' of zoom group meets following condition:

0.8<|Ff'/Bf'|<1.1。

One as large aperture of the present invention wide-angle zoom lens is improved, and described first lens and described second lens are directly near assembling.

One as large aperture of the present invention wide-angle zoom lens is improved, and is provided with packing ring between described second lens and described 3rd lens.

One as large aperture of the present invention wide-angle zoom lens is improved, by spacer ring close-fitting between described 4th lens and described 5th lens, by spacer ring close-fitting between described 5th lens and described 6th lens.

One as large aperture of the present invention wide-angle zoom lens is improved, and described 7th lens and described 8th lens are directly near assembling.

One as large aperture of the present invention wide-angle zoom lens is improved, and described 6th lens and the 7th lens are bonded by optical cement, and described 8th lens, described 9th lens and described tenth lens are bonded by optical cement.

One as large aperture of the present invention wide-angle zoom lens is improved, the focal length of described 4th lens is Bf4, the focal length of described 5th lens is Bf5, the focal length of the lens combination of described 6th lens and described 7th lens gummed is Bf6, the focal length of the lens combination of described 8th lens, described 9th lens and described tenth lens gummed is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

One as large aperture of the present invention wide-angle zoom lens is improved, and described first lens meet the following conditions to the focal length of described tenth lens and refractive index:

-18.12≤f1≤-15.20	1.6≤n1≤1.85
		-12.85≤f2≤-10.12	1.62≤n2≤1.88
22.32≤f3≤26.51	1.75≤n3≤1.95
		32.41≤f4≤36.01	1.5≤n4≤1.7
9.12≤f5≤12.03	1.4≤n5≤1.65
		-8.99≤f6≤-6.15	1.7≤n6≤1.85
12.22≤f7≤17.24	1.55≤n7≤1.75
		5.53≤f8≤8.22	1.6≤n8≤1.82
-7.21≤f9≤-5.33	1.55≤n9≤1.7
		10.57≤f10≤14.62	1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative;

Wherein, f1 to f10 corresponds respectively to the focal length of the first lens to the tenth lens; N1 to n10 corresponds respectively to the refractive index of the first lens to the tenth lens.

Relative to prior art, the present invention adopts mixing of glass spheric glass and Glass aspheric eyeglass, aspherical lens possesses stronger aberration correction ability, can reach higher performance, reasonably arranging Glass aspheric eyeglass can substitution number piece glass spheric glass, can simplify the optical texture of camera lens thus, reduce volume, promote efficiency of assembling, focal range of the present invention is 2.8mm-10mm, and focal length zoom ratio scope is 2.5-3.5 times; And the optics overall length of camera lens effectively can be reduced by the structure using glass spheric glass to mix with Glass aspheric eyeglass, camera lens is meanwhile made to possess higher imaging performance, optics overall length of the present invention is less than 50mm, there is the maximum clear aperature of F1.2, and camera lens can use and do not run Jiao under the environment of-40 DEG C-+80 DEG C, visible ray 3 mega pixel resolution can also be reached.

In a word, the present invention can reach the perfection balance of volume, performance and cost, has the advantages such as the wide and relative aperture of compact conformation, good imaging quality, available burnt section is large.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Fig. 2 is one of optical system diagram of the present invention.

Fig. 3 is optical system diagram two of the present invention.

Embodiment

Below with reference to specific embodiment, the present invention and beneficial effect thereof are described in further detail, but the specific embodiment of the present invention is not limited thereto.

As depicted in figs. 1 and 2, a kind of large aperture provided by the invention wide-angle zoom lens, comprises zoom group 1 and compensating group 2, and total focal power of zoom group 1 is just, total focal power of compensating group 2 is negative, carries out zoom by the interval changing zoom group 1 and compensating group 2;

Compensating group 2 comprises the 3rd lens 23 of the first lens 21 of the tactic convex-concave negative power from object space side, the second lens 22 of concave-concave negative power and convex-concave positive light coke;

Zoom group 1 comprises the tenth lens 17 of the 4th lens 11 of the tactic convex-concave positive light coke from object space side, the 5th lens 12 of biconvex positive light coke, the 6th lens 13 of convex-concave negative power, the 7th lens 14 of convex-concave positive light coke and the 8th lens 15 of biconvex positive light coke, the 9th lens 16 of concave-concave negative power and biconvex positive light coke;

4th lens 11 are glass aspheric lenses;

The focal length Ff' of the compensating group 2 and focal length Bf' of zoom group 1 meets following condition:

0.8<|Ff'/Bf'|<1.1。

First lens 21 and the second lens 22 are directly near assembling.

Packing ring is provided with between second lens 22 and the 3rd lens 23.

By spacer ring close-fitting between 4th lens 11 and the 5th lens 12, by spacer ring close-fitting between the 5th lens 12 and the 6th lens 13.

7th lens 14 and the 8th lens 15 are directly near assembling.

6th lens 13 and the 7th lens 14 are bonded by optical cement, and the 8th lens 15, the 9th lens 16 and the tenth lens 17 are bonded by optical cement.

The focal length of the 4th lens 11 is Bf4, the focal length of the 5th lens 12 is Bf5, the focal length of the lens combination of the 6th lens 13 and the 7th lens 14 gummed is Bf6, the focal length of the lens combination of the 8th lens 15, the 9th lens 16 and the tenth lens 17 gummed is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group 1 exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

First lens 21 meet the following conditions to the focal length of the tenth lens 17 and refractive index:

-18.12≤f1≤-15.20	1.6≤n1≤1.85
		-12.85≤f2≤-10.12	1.62≤n2≤1.88
22.32≤f3≤26.51	1.75≤n3≤1.95
		32.41≤f4≤36.01	1.5≤n4≤1.7
9.12≤f5≤12.03	1.4≤n5≤1.65
		-8.99≤f6≤-6.15	1.7≤n6≤1.85
12.22≤f7≤17.24	1.55≤n7≤1.75
		5.53≤f8≤8.22	1.6≤n8≤1.82
-7.21≤f9≤-5.33	1.55≤n9≤1.7
		10.57≤f10≤14.62	1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative;

Wherein, f1 to f10 corresponds respectively to the focal length of the first lens 21 to the tenth lens 17; N1 to n10 corresponds respectively to the refractive index of the first lens 21 to the tenth lens 17.

Practice shows: focal range of the present invention is 2.8mm-10mm, and focal length zoom ratio scope is 2.5-3.5, and optics overall length is less than 50mm.

Embodiment 1

Ten lens of this camera lens face type in totally two ten faces, radius-of-curvature, lens thickness, lens pitch, lens index and K value meet the following conditions respectively:

Table 1: the physical parameter of ten lens.

Face sequence number	Face type	R	D	nd	K value
						1	Sphere	30.56	0.75	1.7
2	Sphere	8.35	4.31
						3	Sphere	-30.55	0.7	1.7
4	Sphere	10.65	2.2
						5	Sphere	15.35	2	1.85
6	Sphere	40.15	Airspace is variable
						Diaphragm	Plane	PL	Airspace is variable
7	Aspheric surface	12.35	1.5	1.6	-2.5
						8	Aspheric surface	30.12	0.1		14.1
9	Sphere	8.91	3.5	1.5
						10	Sphere	-10.65	0.1
11	Sphere	32.65	0.65	1.77
						12/13	Sphere	4.51	1.96	1.65
14	Sphere	7.25	0.45
						15	Sphere	17.21	2.5	1.71
16/17	Sphere	-6.31	0.7	1.65
						18/19	Sphere	10.63	2.82	1.69
20	Sphere	25.131	Airspace is variable

In upper table, " R " is radius-of-curvature, "-" number represents that direction is negative, " PL " represents plane, upper table the same face sequence number existing refractive index data n, have again data D, data D represents the thickness at this lens axial line place, the same face sequence number only has data D and does not have refractive index data n, and data D represents the spacing of these lens to next lens face.

Wherein have the 7th of non-spherical structure the, 8 surface configurations can use following formulae express:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\&alpha;}}_1{r}^2+{\mathrm{\&alpha;}}_2{r}^4+{\mathrm{\&alpha;}}_3{r}^6+{\mathrm{\&alpha;}}_4{r}^8+{\mathrm{\&alpha;}}_5{r}^{10}+{\mathrm{\&alpha;}}_6{r}^{12}+{\mathrm{\&alpha;}}_7{r}^{14}+{\mathrm{\&alpha;}}_8{r}^{16}.$

Wherein C=1/R

Table 2: 7th, the aspheric surface parameter on 8 surfaces.

	Face sequence number: 7	Face sequence number: 8
			α 1 parameter	3.201212E-005	3.581426E-004
α 2 parameter	-3.831690E-006	4.883452E-006
			α 3 parameter	-1.436421E-006	-1.2891472E-006
α 4 parameter	4.328164E-008	4.354671E-008
			α 5 parameter	0	0
α 6 parameter	0	0
			α 7 parameter	0	0
α 8 parameter	0	0

In the present embodiment, camera lens uses and does not run Jiao under the environment of-40 DEG C ~+80 DEG C, can also realize visible ray and near infrared imaging sharpness all more than 3 mega pixels.

Certainly, the present invention can carry out zoom by the interval changing zoom group 1 and compensating group 2, and as shown in Figure 3, the interval between zoom group 1 and compensating group 2 is less, that is, can adjust interval therebetween as required, to carry out zoom operation.

In a word, the present invention adopts mixing of glass spheric glass and Glass aspheric eyeglass, aspherical lens possesses stronger aberration correction ability, can reach higher performance, reasonably arranging Glass aspheric eyeglass can substitution number piece glass spheric glass, can simplify the optical texture of camera lens thus, reduce volume, promote efficiency of assembling, focal range of the present invention is 2.8mm-10mm, and focal length zoom ratio scope is 2.5-3.5 times; And the optics overall length of camera lens effectively can be reduced by the structure using glass spheric glass to mix with Glass aspheric eyeglass, camera lens is meanwhile made to possess higher imaging performance, optics overall length of the present invention is less than 50mm, there is the maximum clear aperature of F1.2, and camera lens can use and do not run Jiao under the environment of-40 DEG C-+80 DEG C, visible ray 3 mega pixel resolution can also be reached.

The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.

Claims (8)

1. a large aperture wide-angle zoom lens, comprises zoom group and compensating group, and total focal power of described zoom group is just, total focal power of described compensating group is negative, carries out zoom by the interval changing described zoom group and described compensating group; It is characterized in that:

Described compensating group comprises from object space side the 3rd lens of the first lens of tactic convex-concave negative power, the second lens of concave-concave negative power and convex-concave positive light coke;

Described zoom group comprises the tenth lens of the 4th lens of the tactic convex-concave positive light coke from object space side, the 5th lens of biconvex positive light coke, the 6th lens of convex-concave negative power, the 7th lens of convex-concave positive light coke and the 8th lens of biconvex positive light coke, the 9th lens of concave-concave negative power and biconvex positive light coke;

Described 4th lens are glass aspheric lenses;

The focal length Ff' of described compensating group and the focal length Bf' of zoom group meets following condition:

0.8<|Ff'/Bf'|<1.1。

2. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: described first lens and described second lens are directly near assembling.

3. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: be provided with packing ring between described second lens and described 3rd lens.

4. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: by spacer ring close-fitting between described 4th lens and described 5th lens, by spacer ring close-fitting between described 5th lens and described 6th lens.

5. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: described 7th lens and described 8th lens are directly near assembling.

6. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: described 6th lens and the 7th lens are bonded by optical cement, and described 8th lens, described 9th lens and described tenth lens are bonded by optical cement.

7. large aperture according to claim 6 wide-angle zoom lens, it is characterized in that: the focal length of described 4th lens is Bf4, the focal length of described 5th lens is Bf5, the focal length of the lens combination of described 6th lens and described 7th lens gummed is Bf6, the focal length of the lens combination of described 8th lens, described 9th lens and described tenth lens gummed is Bf7, and the focal length Bf' of above-mentioned focal length and zoom group exists following relation:

2.6<|Bf4/Bf'|<4.1；

0.8<|Bf5/Bf'|<1.6；

0.7<|Bf6/Bf'|<1.7；

0.8<|Bf7/Bf'|<1.9。

8. large aperture according to claim 1 wide-angle zoom lens, is characterized in that: described first lens meet the following conditions to the focal length of described tenth lens and refractive index:

-18.12≤f1≤-15.20 1.6≤n1≤1.85 -12.85≤f2≤-10.12 1.62≤n2≤1.88 22.32≤f3≤26.51 1.75≤n3≤1.95 32.41≤f4≤36.01 1.5≤n4≤1.7 9.12≤f5≤12.03 1.4≤n5≤1.65 -8.99≤f6≤-6.15 1.7≤n6≤1.85 12.22≤f7≤17.24 1.55≤n7≤1.75 5.53≤f8≤8.22 1.6≤n8≤1.82 -7.21≤f9≤-5.33 1.55≤n9≤1.7 10.57≤f10≤14.62 1.6≤n10≤1.78

In upper table, " f " is focal length, and " n " is refractive index, and "-" number represents that direction is negative;

Wherein, f1 to f10 corresponds respectively to the focal length of the first lens to the tenth lens; N1 to n10 corresponds respectively to the refractive index of the first lens to the tenth lens.